Grinding-machine.



PATENTED JULY 18, 1905.

H. G. ISENBERG.

GRINDING MACHINE.

APPLICATION FILED AUG. 15, 1904.

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UNTTED STATES Patented July 18, 1905.

PATENT OEErcE.

HERBERT G. ISENBERG, OF JOHNSTOl/VN, PENNSYLVANIA, ASSIGNOR TO THE LORAIN STEEL COMPANY, A CORPORATION OF PENNSYLVANIA.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 795,224, dated July 18, 1905.

Application filed August 15,1904. Serial No. 220,753.

To all wlwm it may concern.-

Be it known that I, HERBERT G. IsENBERe, of Johnstown, in the county of Oambria and State of Pennsylvania, have invented a new and useful Improvement in Grinding-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention has relation to certain new and useful improvements in grinding-machines, and is designed to provide a simple form of machine by means of which objects may be ground to a true cylindrical form and which shall be particularly adapted for the purpose of finishing the bearing pins or pivots of switch tongues or points. It is very desirable in many cases to form these tongues or points of a steel so hard that it is practically impossible to finish the pins or pivots by means of the ordinary shop-tools, and the difliculty of providing means for satisfactorily finishing these parts has heretofore prevented the general use of such tongues except in a form in which pins or pivots of softer metal were cast or otherwise secured therein.

My present invention consists in the provision of work-holding devices so constructed and arranged that the part of the object to be ground or finished may be rotated in a circular path about the periphery of a rotating grinding or finishing tool without revolving the entire object about the axis of said tool, in combination with a grindin or finishing tool rotating upon a relative ly fixed axis of rotation and provided with means whereby the tool may be fed to the work. Means are also provided for taking up the wear of the tool and for regulating the pressure of the work on the tool.

The invention also consists in the novel construction, arrangement, and combination of parts, all substantially as hereinafter described, and pointed out in the appended claims, reference being had to the accompanying drawings, in which Figure 1 is a plan view of a machine embodying my invention, Fig. 2, a section on the line 2 2 of Fig. 1 looking toward the grinding-tool; Fig. 3, a side view, and Fig. 4 an elevation of the face plate or disk.

The numeral 1 designates a bed or base, in bearings 2 of which is journaled a shaft 3, upon which is mounted a face plate or disk 4, formed with a radial slot 5. Mounted in said slot upon a screw 6 is a slidable block or head 7, carrying a stud 8, to which is connected one end portion of a beam 9, whose opposite end portion is pivotally connected to a cross-head 10, mounted to reciprocate horizontally in guides 11 of a base or bed 11 On the shaft 3 is a pulley 12, driven bya belt 13 from any suitable source of power. The beam 9 is provided with suitable clamps 13 for securing thereto the work. In the drawings I have shown this work as consisting of a tongue-switch A, the pin a of which is to be finished.

14 designates the finishing-tool, which consists of a grinding-wheel mounted upon a horizontal shaft 15, supported in bearings 16 of a frame 17 and carrying a pulley 18, driven by a belt 19. The frame 17 is mounted to slide on the base 1 toward and away from the face plate or disk, the adjustment or feed being effected by means of a screw 20.

The operation of the machine will be readily understood. As the face-plate is rotated the beam 9 and the work A are given a movement similar to that of a connecting rod or pitman, and the pin (1 describes a circle about the grinding-wheel 14, thus bringing the entire circumference of the pin into contact with said wheel during each revolution of the face-plate. This insures a perfectly true and accurate surfacing of the pin. By means of the screw 6 the wear of the grinding-wheel can be taken care of and the pressure of the work on the wheel adjusted;

The screw 20 may be worked by hand to feed the grinding-wheel up to the work, or said screw may be provided with any suitable automatic feed attachment.

It will be obvious that instead of driving the face-plate and the grinding-wheel by belts and pulleys shown they may be driven by directconnected motors or by any other suitable gearing, or, if desired, the face-plate may be driven by any suitable power applied through the beam 9.

Various other changes may be made in the in echanical details of the machine without departing from the spirit and scope of my invention. Hence I do not wish to limit myself to the particular embodiment thereof which I have herein shown and described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a machine of the class described, the combination with a circular rotatable tool, of a work-support arranged to carry the work around the periphery of the said tool.

27 In a machine for grinding cylindrical objects, the combination with a grindingwheel arranged to be rotated about a relatively :[ixed axis, of a work-support arranged to carry the objects to be ground around the periphery of the said. wheel.

3. In a machine ol the character described, the combination with a grinding-wheel and means for rotating the same about a relatively fixed axis, of a rotary member having its axis coincident with the axis of the grinding-wheel, a reciprocating member, and a work-support connected at one end portion to the said rotatable member and at its opposite end portion to the reciprocating memher.

4. In a grinding-machine, the combination with a rotatable face-plate or head having its axis coincident with that of the grinding-wheel, a cross-head arranged to reciprocate horizontally at right angles to said axis,

and a work-carrier connected at one end to said face-plate or head and at the other end to the said cross-head.

5. In a grinding-machine, the combination with a rotating grinding-wheel, and means for adjusting or feeding the same in the direction of its axis, oi. a face-plate, or the like, arranged to rotate on an axis coincident with that of the grinding-wheel, a horizoi'itally-reciprocating cross-head, and a workcarrier connected at one end portion to said face-plate, and at the opposite end portion to said cross-head.

6. In a grinding-machine, the combination with a rotatable grinding-wheel, of a rotary member adjacent to said wheel, a horizontally-reciprocable cross-head, a worl=supporting member connected at one end portion to said rotary member and at the opposite end portion to said. crosshead, and means for effecting a radial adjustment of that end portion. of the work-supporting member which is connected to the said rotary member.

7. In a grinding-machine, the combination of a rotary member, a radially-adjustable block or head carried thereby, a horizontally-reciprocable cross-head, and a work supporting beam connected at one end portion to said block and at the other end portion to said cross-head.

In testimony whereof I have allixed my signature in presence of two witnesses.

HERBERT G. ISENBERG.

IVitnesses Lonnr'ro OCONNELL, H. W. SMITH. 

